JP2016161387A - Core sensor and measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the occurrence of such malfunction that a coil formed by interposing a magnetic core into a bobbin gets loose during assembling.SOLUTION: A core sensor includes: a magnetic core 11 annularly formed as a whole; a bobbin 12 externally fitted to the magnetic core 11; a wiring 13 formed on the magnetic core 11 in a state that the bobbin 12 is interposed; and lead wires 14, 15 connected to a tip end part 13a and an end part 13b respectively led out from the wiring 13. The bobbin 12 includes: a wiring forming region AR1 where the wiring 13 is formed along a peripheral direction of the magnetic core 11; and a fixing region AR2 where each of the end parts 13a, 13b is fixed. The fixing region AR2 of the bobbin 12 is formed with an isolation wall 41 erected on the surface in the fixing region AR2 and isolating the tip end part of the lead wire 14 connected with the start end part 13a and the tip end part of the lead wire 15 connected with the end part 13b from each other; and a pair of holding parts 33, 34 for fixing each of end parts 13a, 13b individually to the fixing region AR2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a core sensor having a winding formed by interposing a bobbin on an annular magnetic core as a whole, and a measuring apparatus including the core sensor.

  As this type of core sensor, the present applicant has already proposed a core sensor used in an ammeter (clamp ammeter) disclosed in Patent Document 1 below. This core sensor is used as a pair, and is configured by forming a separate winding by interposing a bobbin between magnetic cores that are substantially arc-shaped and arranged to face each other in pairs. Each core sensor is covered with a core cover. In this case, each of the core covers is formed of a pair of cover portions that are divided into two parts so as to house the core sensor and make them face to face with each other. In addition, on the inner surface facing the other cover portion in one cover portion, each connecting portion formed by connecting a lead wire separately to the start end portion and the end end portion drawn from the winding is individually provided A total of two holding cylinders are provided so as to be inserted and housed.

  In this ammeter, each connecting portion of the core sensor is housed and held separately in the holding cylinder portion of the corresponding core cover (specifically, the cover portion constituting the core cover), and is isolated from the peripheral portion. It is possible to prevent the occurrence of unforeseen situations such as short-circuiting each other, and even if a load such as a tensile force is applied to each lead wire side, it is compulsory from within the holding cylinder. It is possible to reliably prevent the material from being pulled out. Further, the operation of fixing the position of each connecting portion itself can be simplified because the connecting portion is simply inserted into the holding cylinder portion, and the working efficiency can be increased.

JP 2001-228175 A (page 2-3, FIG. 1-2)

  However, the conventional core sensor has the following problems to be improved. That is, in this type of core sensor, when mounting a magnetic core on which a winding is formed on a cover portion, generally, first, the winding is performed on a bobbin mounted on the magnetic core using a winding machine or the like. Next, a step of connecting (for example, soldering) the lead wires to the start end and the end of the winding is performed, and then a magnetic core having a lead connected to the winding is performed. And a step of attaching to the cover portion.

  However, in the conventional core sensor, in the last step of the above-described three steps, that is, in the step of attaching the magnetic core having each lead wire connected to the winding to the cover portion, one end of the winding and the other end Insert one connecting part with the lead wire and another connecting part between the terminal end of the winding and the other lead wire into the two holding cylinders projecting from the inner surface of one cover part. The storing operation is executed. For this reason, in the conventional core sensor, after the step of connecting the lead wires to the start end and the end of the winding, respectively, the step of attaching the magnetic core having the lead wires connected to the winding to the cover portion is executed. Previously, for example, when transporting a magnetic core with lead wires connected to the windings, when a load such as a tensile force is applied to each lead wire side, the windings will unwind There is a problem that needs to be improved.

  The present invention has been made to remedy such a problem, and a core sensor capable of reducing the occurrence of problems such as unwinding of a winding formed by interposing a bobbin on a magnetic core during assembly, and the core sensor. The main object is to provide a measuring apparatus equipped with

  In order to achieve the above object, a core sensor according to claim 1 includes a magnetic core formed in an annular shape as a whole, a bobbin externally fitted to the magnetic core, and a winding formed on the magnetic core with the bobbin interposed. A core sensor comprising a wire and lead wires respectively connected to a starting end and a terminating end drawn from the winding, wherein the bobbin is formed by the winding along a circumferential direction of the magnetic core A winding forming region to be fixed, and a fixing region for fixing the starting end and the terminal end, and the fixing region of the bobbin is erected on the surface of the fixing region, and the starting end is connected A separation wall that separates the distal end portion of the one lead wire and the distal end portion of the other lead wire to which the terminal end portion is connected, and the distal end portion and the other lead of the one lead wire A pair of holding portions for holding the tip separately is formed.

  The core sensor according to claim 2 is the core sensor according to claim 1, wherein one holding portion of the pair of holding portions is one wall surface of the separation wall facing the tip end portion of the one lead wire. And the other holding portion of the pair of holding portions is provided on the other lead wire of the other lead wire. Another convex body is provided that extends from the other wall surface of the separation wall facing the distal end portion and holds the distal end portion with the surface in the fixed region.

  The core sensor according to claim 3 is the core sensor according to claim 1 or 2, wherein the lead wire drawn out from the holding portion is provided on any one of the holding portion and the surface of the fixing region of the bobbin. A hook for hooking is formed.

  According to a fourth aspect of the present invention, there is provided a measuring apparatus comprising the core sensor according to any one of the first to third aspects, wherein an amplitude corresponding to a current value of a measured current flowing through a measurement target inserted in the annular magnetic core. Is output from between the one lead wire and the other lead wire.

  According to the core sensor of claim 1 and the measuring device of claim 4, the core sensor is connected to the start end and the end end drawn from the winding formed in the winding forming region of the bobbin fitted on the magnetic core. A separation wall that separates the tip portions of the lead wires from each other and a pair of holding portions for individually holding the tip portions are formed in the fixing region of the bobbin. In the state where the lead wire is connected to the start and end portions of the winding, the tips of the lead wires are compared with each other as compared with the case where the lead wire is connected with the tape or inserted into the hole of the core cover (cover portion). Can be easily and reliably insulated. In addition, by holding the tip of each lead wire using a pair of holding portions formed in the fixed region, the core sensor can be manufactured after the core sensor is manufactured, compared to a configuration without such a holding portion. Even if a load such as a tensile force is applied to each lead wire before execution of the step of attaching to the core cover, the occurrence of problems such as unwinding of the winding can be greatly reduced.

  Further, in the core sensor according to claim 2 and the measuring device according to claim 4, each holding portion extends from each wall surface facing each tip portion of the separation wall that separates the tip portions of the lead wires from each other, and A convex body that holds the tip portion between the front surface and the surface in the fixed region is provided. Therefore, according to the core sensor and the measuring apparatus, the leading end of one of the lead wires connected to the core wire is pushed into the gap between the surface of the corresponding fixed region and the convex body with a simple operation. The leading end portion of one lead wire can be reliably held by one holding portion. In addition, the tip of the other lead wire is pushed into the gap between the surface of the corresponding fixed region and the convex body with the other end of the other lead wire having the terminal end connected to the core wire by the simple operation. It can be held by the holding part. For this reason, it is possible to remarkably reduce the labor (man-hours) for holding the tip of each lead wire as compared with fixing with tape or inserting into the hole of the core cover (cover). .

  Further, according to the core sensor according to claim 3 and the measuring device according to claim 4, since the hook portion is formed on either the holding portion or the surface of the fixing region of the bobbin, the lead wire is used as the hook portion. Compared with the configuration in which it is pulled out from the holding part in a hooked state (a state in which frictional force is acting between each surface of the lead wire and the hooked part), compared to a structure that is simply inserted into the hole of the core cover (cover part). Even when a load such as a larger tensile force is applied, it is possible to reliably prevent the occurrence of problems such as winding unwinding or disconnection. In addition, the time and effort required to hold the tip of each lead wire is significantly higher than when the tip of each lead wire is fastened with tape or inserted into the hole in the core cover (cover). Can be reduced.

4 is an explanatory diagram for explaining an internal configuration in core covers 4 and 5 of the ammeter 1. FIG. FIG. 2 is an exploded perspective view for explaining a configuration of core sensors 2 and 3 in FIG. 1. It is a perspective view of the core sensors 2 and 3 before providing the coil | winding 13 and the lead wires 14 and 15. FIG. FIG. 4 is an enlarged view of a main part when a fixed region AR2 in the bobbin 12 of the core sensors 2 and 3 is viewed from the direction of arrow A in FIG. FIG. 4 is an enlarged view of a main part when a fixed region AR2 in the bobbin 12 of the core sensors 2 and 3 is viewed from the direction of arrow B in FIG. FIG. 4 is an enlarged view of a main part when a fixed region AR2 in the bobbin 12 of the core sensors 2 and 3 is viewed from the direction of arrow C in FIG. It is a perspective view of the core sensors 2 and 3 in the state which provided the coil | winding 13 and the lead wires 14 and 15. FIG. It is a principal part enlarged view for demonstrating the structure of other holding | maintenance part 33A, 34A.

  Hereinafter, embodiments of a core sensor and a measuring device will be described with reference to the accompanying drawings. In addition, an ammeter will be described as an example of the measurement apparatus.

  First, the configuration of the ammeter 1 will be described with reference to FIG.

  As shown in FIG. 1, the ammeter 1 includes a pair of core sensors 2 and 3 and core covers 4 and 5 that individually accommodate the core sensors 2 and 3, respectively, and the core covers 4 and 5 rotate. By being connected so as to be rotatable about the axis L, each of the accommodated core sensors 2 and 3 is configured as a clamp-type ammeter that can be opened and closed.

  As an example, each of the core sensors 2 and 3 includes a magnetic core 11, a bobbin 12, a winding 13, and lead wires 14 and 15, and is configured identically. In this case, as shown in FIG. 2, the magnetic core 11 is formed by stacking a plurality of flat plates formed in a substantially arc shape in plan view using a magnetic material as an example. The magnetic core 11 may be composed of one magnetic body instead of such a structure in which a plurality of magnetic bodies are stacked.

  As an example, as shown in FIG. 2, the bobbin 12 includes an inner peripheral bobbin 21, an outer peripheral bobbin 22, one side bobbin 23, and the like, each formed using a synthetic resin material having electrical insulation. 1, 3, and 7, and is externally fitted to the magnetic core 11 so as to cover the portions excluding both ends of the magnetic core 11.

  In this case, as shown in FIG. 2, the inner peripheral bobbin 21 is mounted on the inner peripheral surface side of the magnetic core 11, and the outer peripheral bobbin 22 is mounted on the outer peripheral surface side of the magnetic core 11. With this configuration, the magnetic core 11 is covered with the inner peripheral bobbin 21 and the outer peripheral bobbin 22 except for both ends (the inner bobbin configured by the inner peripheral bobbin 21 and the outer peripheral bobbin 22 is the magnetic core 11. 11 is externally fitted to the portion excluding both end portions).

  In this example, one side bobbin 23 is mounted on one side (upper side in FIG. 2) of the magnetic core 11 in which the inner peripheral bobbin 21 and the outer peripheral bobbin 22 are mounted. The other side bobbin 24 is mounted on the other side surface (lower surface side in FIG. 2) of the magnetic core 11 in a state where the inner peripheral bobbin 21 and the outer peripheral bobbin 22 are mounted. With this configuration, the magnetic core 11 is covered with the one side-side bobbin 23 and the other side-side bobbin 24 (the one side-side bobbin 23 and the other side-side bobbin 23). The outer bobbin composed of the other side bobbin 24 is further fitted over the above-described inner bobbin except for the ends of the magnetic core 11).

  In this example, as described above, the bobbin 12 is composed of the four bobbins 21, 22, 23, and 24, and a configuration in which the portion excluding both ends of the magnetic core 11 is doubled is employed. For example, the bobbin 12 is constituted by two of the inner peripheral bobbin 21 and the outer peripheral bobbin 22, or two of the one side bobbin 23 and the other side bobbin 24, and the both ends of the magnetic core 11 are excluded. It is also possible to adopt a configuration that covers the region in a single layer.

  As shown in FIGS. 1 to 3 and 7, the outer peripheral surface of the bobbin 12 (in this example, the outer peripheral surface of the outer bobbin composed of one side-side bobbin 23 and another side-side bobbin 24) The pair of flanges 31 and 32 are provided upright apart along the circumferential direction of the magnetic core 11. As shown in FIGS. 1 to 7, between the flange 32 near the rotation axis L of the pair of flanges 31 and 32 on the outer peripheral surface of the bobbin 12 and the tip end portion of the bobbin 12 near the rotation axis L. A pair of holding portions 33 and 34 are formed in this area.

  An area AR1 (see FIG. 1) sandwiched between the pair of flanges 31 and 32 on the outer peripheral surface of the bobbin 12 constitutes a winding formation area (hereinafter also referred to as a winding formation area AR1) in which the winding 13 is formed. To do. Further, an area AR2 (see FIG. 1) in which the pair of holding portions 33 and 34 are formed on the outer peripheral surface of the bobbin 12 is drawn out from the winding 13 formed in the adjacent winding forming area AR1 as described later. The fixed area | region (henceforth fixed area | region AR2) to which the start end part 13a and the termination | terminus part 13b of the wound winding 13 were fixed is comprised.

  The configuration of the fixed area AR2 will be specifically described. In the present example, as an example, as shown in FIGS. 2, 3, 4, and 6, one side surface constituting a part of the fixed area AR2 on the outer peripheral surface of the bobbin 12 One holding portion 33 is formed on the surface of the side bobbin 23 (specifically, the surface of the part covering the outer peripheral surface of the magnetic core 11 in the one side bobbin 23), and the fixed region AR2 on the outer peripheral surface of the bobbin 12 is formed. The other holding portion 34 is formed on the surface of the other side-side bobbin 24 constituting the remaining part (specifically, the surface of the other side-side bobbin 24 covering the outer peripheral surface of the magnetic core 11). Yes.

  The one holding portion 33 is erected on the surface of the fixed region AR2 of the one side bobbin 23 at a certain height h (see FIGS. 5 and 6) along the circumferential direction of the magnetic core 11 at a substantially right angle. The separation wall 41 and a wall surface as one wall surface of the separation wall 41 (in this example, the upper edge of this wall surface) are located in the direction opposite to the side of the separation wall 41 (the other side bobbin 24 side) A convex body as one convex body (in the form of a cylindrical body or a prismatic body) that extends in a state of being substantially perpendicular to the separation wall 41 toward the side where a distal end portion to be described later of the line 14 is disposed. Alternatively, as described later, it may be a wall-like body extending along the upper edge of the separation wall 41. In this example, as an example, a wall-like body) 42 is provided. The convex body 42 has a length over substantially the entire upper edge of the separation wall 41 and a constant width (extension length from the upper edge of the separation wall 41) W as shown in FIGS. Has been. Further, the height h of the separation wall 41 is formed slightly lower than the entire diameter including the covering of the lead wires 14 and 15 formed of the covered electric wire. Further, the width W of the convex body 42 is formed to be longer than the entire radius including the covering of the lead wires 14 and 15.

  With the above configuration, the leading end portion of the lead wire 14 in which the starting end portion 13a of the winding 13 is connected to the core wire of the lead wire 14 that has been exposed with the coating removed, as will be described later, by soldering or the like is shown in FIG. In FIG. 1 and FIG. 7 as it is pushed into the gap G (see FIGS. 5 and 6) between the surface of the one side-side bobbin 23 and the inner surface of the convex body 42 from the direction indicated by the white arrow. When pressed against the wall surface of the separation wall 41 (the wall surface facing the distal end portion of the lead wire 14), the holding portion 33 causes the distal end portion of the lead wire 15 to be described later by the separation wall 41. And is held (sandwiched) between the surface of the fixed region AR2 and the convex body 42 in the one side-side bobbin 23, whereby the tip of the lead wire 14 is fixed to the fixed region. Secure to AR2 It has been possible.

  Moreover, the holding | maintenance part 33 is as shown in FIGS. 1-6 of two edge parts (the upper end part and lower end part in FIG. 4, 5) along the length direction of the separation wall 41 in the convex body 42. As shown in FIG. It extends along the circumferential direction of the magnetic core 11 in the direction away from the winding forming area AR1 from the outer surface of the end opposite to the winding forming area AR1 side (lower end in FIGS. 4 and 5). Extending along the thickness direction of the magnetic core 11 (downward in FIG. 3, left-right direction in FIG. 4) from the extended portion 43 to the other side bobbin 24 from the distal end of the extended portion 43 The hook portion 44 is further provided.

  With the above configuration, the tip of the lead wire 14 held between the surface of the fixed region AR2 in the one side bobbin 23 and the convex member 42 is opposite to the winding forming region AR1 side of the convex member 42. As shown by the thick arrows in FIG. 4, the part extending from the end of the first is first drawn out to the other side bobbin 24 side through the lower side of the extended part 43, and then wound through the upper side of the hook part 44. Pull out in the direction opposite to the line forming area AR1 side. As a result, the lead wire 14 can be pulled out from the holding portion 33 in a state where the lead wire 14 is hooked on the hook portion 44 (a state in which a frictional force is acting between the surfaces of the lead wire 14 and the hook portion 44).

  Further, as shown in FIG. 4, the other holding portion 34 has a structure that is substantially plane-symmetric with respect to the holding portion 34 with reference to a virtual plane PL1 that divides the magnetic core 11 into two along its thickness direction. doing. Specifically, the holding portion 34 is erected substantially perpendicularly at a certain height h (see FIGS. 5 and 6) along the circumferential direction of the magnetic core 11 on the surface of the fixed region AR <b> 2 in the other side bobbin 24. The separation wall 41 and the wall surface (in this example, the upper edge of this wall surface) as the other wall surface of the separation wall 41 are located in the direction opposite to the side of the separation wall 41 (one side-side bobbin 23 side). Further, a convex body 42 is provided as another convex body that extends in a state of being substantially perpendicular to the separating wall 41 toward the side of the lead wire 15 where a distal end portion to be described later is disposed. The convex body 42 has a length over substantially the entire upper edge of the separation wall 41 and a constant width (extension length from the upper edge of the separation wall 41) W as shown in FIGS. Has been. Further, the height h of the separation wall 41 and the width W of the convex body 42 are formed to be equal to the holding portion 33.

  With the above configuration, the leading end portion of the lead wire 15 in which the end portion 13b of the winding wire 13 is connected to the core wire of the lead wire 15 exposed with the coating removed by soldering or the like as described later is shown in FIG. 1 is pushed into the gap G (see FIG. 6) between the surface of the other side surface bobbin 24 and the inner surface of the convex body 42 from the direction indicated by the white arrow, and as shown in FIG. When pressed against the wall surface (the wall surface facing the distal end portion of the lead wire 15), the holding portion 34 separates and positions the distal end portion of the lead wire 15 from the distal end portion of the lead wire 14 by the separation wall 41. In addition, the tip of the lead wire 15 can be fixed to the fixing area AR2 by being held (sandwiched) between the surface of the fixing area AR2 and the convex body 42 in the other side bobbin 24. Become There.

  As shown in FIGS. 1 to 6, the holding portion 34 has two end portions (an upper end portion and a lower end portion in FIGS. 4 and 5) along the length direction of the separation wall 41 in the convex body 42. It extends along the circumferential direction of the magnetic core 11 in the direction away from the winding forming area AR1 from the outer surface of the end opposite to the winding forming area AR1 side (lower end in FIGS. 4 and 5). The extension portion 43 and a hook portion 44 extending along the thickness direction of the magnetic core 11 from the tip of the extension portion 43 toward the one side surface bobbin 23 are further provided.

  With the above configuration, the tip of the lead wire 15 held between the surface of the fixed region AR2 in the one side bobbin 23 and the convex member 42 is opposite to the winding forming region AR1 side of the convex member 42. As shown by the thick arrow in FIG. 4, the portion extending from the end of the first is first pulled out to the one side bobbin 23 side through the lower side of the extended portion 43, and then wound through the upper side of the hook portion 44. Pull out in the direction opposite to the line forming area AR1 side. Thus, the lead wire 15 can be pulled out from the holding portion 34 in a state where the lead wire 15 is hooked on the hook portion 44 (a state in which a frictional force is acting between the surfaces of the lead wire 15 and the hook portion 44).

  Next, the manufacturing procedure of the ammeter 1 will be described.

  First, each core sensor 2 and 3 is manufactured. Specifically, two magnetic cores 11 are produced by laminating a plurality of flat plates formed in a substantially arc shape in plan view using a magnetic material. Next, as shown in FIG. 2, the inner peripheral bobbin 21 and the outer peripheral bobbin 22 are mounted on each magnetic core 11, and the one side bobbin 23 and the other side bobbin 24 are mounted. As a result, as shown in FIG. 3, the bobbin 12 is externally fitted to a portion of each magnetic core 11 excluding both ends.

  Subsequently, the winding 13 is formed in the winding forming area AR1 of the bobbin 12 so that the starting end portion 13a and the terminal end portion 13b are positioned in the fixed area AR2 of the bobbin 12 (that is, in a state where the bobbin 12 is interposed). A winding 13 is formed on the magnetic core 11). Next, as shown in FIG. 4, the start end portion 13 a is connected to the core wire of the lead wire 14, and the end portion 13 b is connected to the core wire of the lead wire 15.

  Subsequently, as shown in FIG. 4, the tip end portion of the lead wire 14 having the leading end portion 13 a connected to the core wire is connected to the surface of the one side bobbin 23 (surface of the fixed region AR <b> 2) and the convex body 42 of the holding portion 33. Is pushed into the gap G (see FIG. 6) between the inner surface (the surface facing the surface of the fixed region AR2) until the coating comes into contact with the separating wall 41. As a result, the distal end portion of the lead wire 14 is positioned at a predetermined position in the fixed region AR2 by being along the separation wall 41 of the holding portion 33, and the surface of the one side bobbin 23 and the holding portion 33 are positioned. It hold | maintains between the convex-shaped bodies 42, and is fixed to fixation area | region AR2.

  Further, the tip end portion of the lead wire 15 having the end portion 13b connected to the core wire is connected to the surface of the other side bobbin 24 (surface of the fixed region AR2) and the inner surface of the convex body 42 of the holding portion 34 (surface of the fixed region AR2). The coating is pushed into the gap G (see FIG. 6) between the cover and the separation wall 41 until it comes into contact. As a result, the distal end portion of the lead wire 14 is positioned at a predetermined position in the fixed region AR2 by being along the separation wall 41 of the holding portion 34, and the surface of the other side bobbin 24 and the holding portion 34 are also positioned. It hold | maintains between the convex-shaped bodies 42, and is fixed to fixation area | region AR2. Thus, the lead wires 14 and 15 are separated from each other along the thickness direction of the magnetic core 11 by the holding portions 33 and 34, and by the separation walls 41 and the convex bodies 42 of the holding portions 33 and 34. It is fixed to the fixed area AR2 in an electrically separated state (insulated state).

  Finally, a portion of the lead wire 14 extending from the end opposite to the winding forming area AR1 side of the convex body 42 is first extended of the holding portion 33 as indicated by a thick line in FIG. It is pulled out to the other side bobbin 24 side through the lower side of the portion 43, and then pulled out in the direction opposite to the winding forming area AR1 side through the upper side of the hook portion 44 of the holding portion 33. That is, the lead wire 14 is pulled out from the holding portion 33 in a state of being hooked on the hook portion 44 and bent into a crank shape. Further, a portion of the lead wire 15 extending from the end opposite to the winding forming area AR1 side of the convex body 42 is first extended as shown by an arrow indicated by a thick line in FIG. It is pulled out through the lower side of 43 to the other side bobbin 24 side, and then pulled out through the upper side of the hook part 44 of the holding part 34 in the direction opposite to the winding forming area AR1 side. That is, the lead wire 15 is pulled out from the holding portion 34 in a state of being hooked on the hook portion 44 and bent in a crank shape. Thereby, manufacture of the core sensors 2 and 3 is completed.

  Thus, in the core sensors 2 and 3 and the ammeter 1, the winding 13 is formed on the bobbin 12 fitted on the magnetic core 11, and the lead wire 14 is connected to the start end portion 13 a and the termination end portion 13 b of the winding 13. 15 can be immediately fixed to the bobbin 12 by the convex bodies 42 of the holding portions 33 and 34 without using a tape (insulating tape or the like). For this reason, in the core sensors 2 and 3 and the ammeter 1, after the execution of the process of connecting the lead wires 14 and 15 to the start end portion 13a and the end end portion 13b of the winding 13 (after the manufacture of the core sensors 2 and 3), Even if a load such as a tensile force is applied to the lead wires 14 and 15 before the execution of the process of attaching the core sensors 2 and 3 to the core covers 4 and 5, the winding 13 can be unwound. It is possible to reduce the occurrence of this.

  Further, in the core sensors 2 and 3 and the ammeter 1, the lead wire 14 is pulled out from the holding portion 33 while being hooked on the hook portion 44 of the holding portion 33, and the lead wire 15 is pulled to the hook portion 44 of the holding portion 34. Since it is configured to be pulled out from the holding portion 34 in a hooked state, even if a load such as a large tensile force is applied to the lead wires 14 and 15, it is possible to reliably prevent the occurrence of a problem such as unwinding the winding wire 13. It is possible.

  Next, as shown in FIG. 1, the manufactured core sensors 2 and 3 are accommodated in the core covers 4 and 5, respectively, and lead wires 14 and 15 drawn out from the core sensors 2 and 3 are connected to, for example, the core cover 4. , 5 are connected to a circuit board (not shown) disposed on at least one of the two. Thereby, manufacture of the ammeter 1 is completed.

  The ammeter 1 manufactured in this manner detects a measurement current flowing in a measurement target (not shown) (for example, an electric wire) inserted through the annular magnetic core 11 and an electric signal having an amplitude corresponding to the current value. (Voltage signal or current signal) is output between the pair of lead wires 14 and 15. Therefore, by using this ammeter 1, it is possible to measure the current value of the measurement current based on this electrical signal.

  As described above, according to the core sensors 2 and 3 and the ammeter 1, the start end portion 13 a and the end end portion that are drawn from the winding 13 formed in the winding formation region AR 1 of the bobbin 12 fitted on the magnetic core 11. Since the separation wall 41 that separates the distal ends of the lead wires 14 and 15 connected to 13b from each other and the holding portions 33 and 34 for holding these distal ends are formed in the fixing region AR2 of the bobbin 12, In the state where the winding 13 is formed in the winding forming area AR1 and the lead wires 14 and 15 are connected to the start end portion 13a and the end end portion 13b of the winding 13, it is fixed with tape or a hole in the core cover (cover portion). As compared with the case where the lead wires 14 and 15 are stopped by being inserted into the lead wire 14, the insulating portions 41 can easily and reliably insulate the tip portions of the lead wires 14 and 15. Further, by holding the tip portions of the lead wires 14 and 15 using the holding portions 33 and 34 formed in the fixing region AR2, the tip portions are immediately fixed to the fixing region AR2 of the bobbin 12. The manufacture of the core sensors 2 and 3 can be completed. Therefore, according to the core sensors 2 and 3 and the ammeter 1, the core sensors 2 and 3 are attached to the core covers 4 and 5 after the manufacture of the core sensors 2 and 3, as compared with the configuration without such a holding portion. Even if a load such as a tensile force is applied to the lead wires 14 and 15 before the execution of the process, the occurrence of a problem that the winding wire 13 is unwound can be greatly reduced.

  Further, in the core sensors 2 and 3 and the ammeter 1, the holding portions 33 and 34 are positioned on the leading ends of the lead wires 14 and 15 and positioned on the leading ends of the separating walls 41 that are spaced apart from each other. Is provided with a convex body 42 extending to the side where the tip ends of the corresponding lead wires 14 and 15 are disposed. Therefore, according to the core sensors 2 and 3 and the ammeter 1, the tip end portion of the lead wire 14 having the start end portion 13 a connected to the core wire is connected to the surface of the one side bobbin 23 (surface of the fixed region AR 2) and the holding portion 33. The leading end portion of the lead wire 14 is pushed into the holding portion 33 by a simple operation of pushing into the gap G with the convex body 42 (one convex body) (for example, pushing until the coating comes into contact with the separation wall 41). It can be reliably held. Further, the tip end portion of the lead wire 15 having the end portion 13b connected to the core wire is connected to the surface of the other side bobbin 24 (surface of the fixed region AR2) and the convex body 42 (other convex body) of the holding portion 34. The tip portion of the lead wire 15 can be held by the holding portion 34 by a simple operation of pushing into the gap G between them (for example, pushing until the coating comes into contact with the separation wall 41). For this reason, the labor (man-hours) for holding the leading end portions of the lead wires 14 and 15 is significantly reduced as compared with the case where the lead wires 14 and 15 are held and stopped with tape or inserted into the hole of the core cover (cover portion). be able to.

  Further, according to the core sensors 2 and 3 and the ammeter 1, since the hooks 44 are formed in the holding parts 33 and 34, the lead wires 14 and 15 are hooked on the corresponding hooks 44 (lead wires). 14 and 15 and a state in which a frictional force is acting between the surfaces of the hooking portion 44 corresponding to 14 and 15), by pulling out from each holding portion 33 and 34, compared with a configuration in which it is only inserted into the hole of the core cover (cover portion). Thus, even if a load such as a large tensile force is applied to the lead wires 14 and 15, it is possible to reliably prevent the occurrence of problems such as the winding wire 13 being unwound or broken. In addition, compared to the case where the leading ends of the lead wires 14 and 15 are fixed with tape or inserted into the holes of the core cover (cover portion), the leading ends of the lead wires 14 and 15 are held. Time and effort (man-hours) can be significantly reduced.

  The ammeter 1 employs a configuration in which the holding portions 33 and 34 are formed in a portion covering the outer peripheral surface of the magnetic core 11 in the fixed region AR2 of the bobbin 12 as shown in FIG. The holding portions 33 and 34 are formed together in a portion covering either one of the two side surfaces of the magnetic core 11 in the region AR2, or the holding portion 33, 34 is formed in a portion covering the two side surfaces of the magnetic core 11 in the fixed region AR2. 34 may be formed separately, or a configuration in which the holding portions 33 and 34 are formed together in a portion covering the inner peripheral surface of the magnetic core 11 in the fixed region AR2 may be employed. In addition, a configuration is adopted in which the holding portions 33 and 34 are separately formed at any two of a portion covering the outer peripheral surface of the magnetic core 11 in the fixed region AR2, a portion covering the inner peripheral surface, and a portion covering each side surface. You can also

  Hereinafter, as an example, a configuration in which the holding portions 33A and 34A are formed in a portion covering the inner peripheral surface of the magnetic core 11 in the fixed region AR2 of the bobbin 12 will be described with reference to FIG. The structure of the holding portions 33A and 34A and the formation position of the holding portions 33A and 34A in the fixed area AR2 are mainly different, and the other configurations are substantially the same as those of the bobbin 12 shown in FIGS. For this reason, the same components are denoted by the same reference numerals, and redundant description is omitted, and only different components are described.

  As shown in FIG. 8, the surface of one side-side bobbin 23 that constitutes a part of the fixed region AR <b> 2 on the outer peripheral surface of the bobbin 12 (specifically, the inner peripheral surface of the magnetic core 11 in the one side-side bobbin 23. One holding portion 33A is formed on the surface of the bobbin 12 and the surface of the other side bobbin 24 constituting the remaining part of the fixed area AR2 on the outer peripheral surface of the bobbin 12 (specifically, the other side surface). The other holding portion 34 </ b> A is formed on the surface of the side bobbin 24 covering the inner peripheral surface of the magnetic core 11.

  The one holding portion 33A includes a separation wall 41 erected at a certain height along the circumferential direction of the magnetic core 11 on the surface of the fixed region AR2 of the one side bobbin 23, and one of the separation walls 41. The separation wall is directed from the upper edge of the wall surface to the side of the separation wall 41 (the side opposite to the other side bobbin 24 side, where the leading end of the lead wire 14 (not shown) is disposed). One convex body 42 extending in a state substantially perpendicular to 41 is provided. The convex body 42 has a length that covers almost the entire upper edge of the separation wall 41 and a constant width (extension length from the upper edge of the separation wall 41).

  With the above configuration, the holding portion 33A positions the tip end portion (not shown) of the lead wire 14 to which the start end portion 13a (not shown) of the winding 13 is connected by soldering or the like along the separation wall 41. It is possible to hold and fix between the surface of the fixing region AR2 in the one side surface side bobbin 23 and the convex body 42.

  Further, as shown in FIG. 8, the surface of one side-side bobbin 23 that constitutes a part of the fixed region AR <b> 2 on the outer peripheral surface of the bobbin 12 (the portion covering the inner peripheral surface of the magnetic core 11 in the one side-side bobbin 23. The hook portion 44A is formed on the front surface of the holding portion 33A in parallel with the holding portion 33A and at an interval enough to pass the lead wire 14 (not shown). The hook portion 44A is formed in a hook shape that rises from the surface of one side-side bobbin 23 (that is, the surface of the fixed region AR2) and that has an upper end bent toward the other side-side bobbin 24.

  Further, as shown in FIG. 8, a pair of guide walls 45 extending from the inner peripheral side to the outer peripheral side of the bobbin 12 is formed on the surface of the portion covering one side surface of the magnetic core 11 in one side bobbin 23. ing. In this example, the pair of guide walls 45 are formed in parallel to each other, and the distance between the opposing surfaces is defined to be approximately the same as the diameter of the lead wire 14. Further, projections 46 are formed on the opposing surfaces as shown in FIG. As a result, when the lead wire 14 is pushed between the pair of guide walls 45, each lead 46 can hold (fix) the lead wire by biting the covering of the lead wire. Yes.

  With the above configuration, first, the tip of the lead wire 14 is pushed into the gap G between the surface of the fixed region AR2 and the convex body 42 in the one side-side bobbin 23, as indicated by the bold line in FIG. Secure with. Next, a portion extending from the end opposite to the winding formation area AR1 side of the convex body 42 of the lead wire 14 is passed through the gap between the holding portion 33A and the hook portion 44A, and then the hook portion 44A. Then, it is pulled out to the side of the magnetic core 11 and pushed between the pair of guide walls 45. Accordingly, the lead wire 14 can be pulled out from the holding portion 33A located on the inner peripheral side of the bobbin 12 to the outer peripheral side of the bobbin 12 in a state where the lead wire 14 is hooked on the hook portion 44A and bent in an L shape. It has become.

  On the other hand, the other holding portion 34 </ b> A includes a separation wall 41 erected at a certain height along the circumferential direction of the magnetic core 11 on the surface of the fixed region AR <b> 2 in the other side bobbin 24, and the other in the separation wall 41. Toward the side of the separation wall 41 from the upper edge of the wall surface (in the direction opposite to the one side bobbin 23 side and the side where the tip of the lead wire 15 is disposed) Another convex body 42 extending in a substantially right angle state is provided. The convex body 42 has a length that covers almost the entire upper edge of the separation wall 41 and a constant width (extension length from the upper edge of the separation wall 41).

  With the above configuration, the holding portion 34 </ b> A positions the distal end portion (not shown) of the other lead wire 15 to which the end portion 13 b (not shown) of the winding 13 is connected by soldering or the like along the separation wall 41. In addition, it is possible to hold and fix between the surface of the fixing area AR2 in the other side bobbin 24 and the convex body 42.

  Further, as shown in FIG. 8, the surface of the other side bobbin 24 constituting a part of the fixed region AR2 on the outer peripheral surface of the bobbin 12 (the portion covering the inner peripheral surface of the magnetic core 11 in the other side bobbin 24). The hook portion 44A is formed alongside the holding portion 34A and at an interval enough to allow the lead wire 15 to pass therethrough. The hook portion 44A is formed in a hook shape that rises from this surface of the other side surface bobbin 24 (that is, the surface of the fixed region AR2) and bends toward the one side surface bobbin 23 side.

  Further, as shown in FIG. 8, a pair of guide walls 45 extending from the inner peripheral side to the outer peripheral side of the bobbin 12 is formed on the surface of the part of the other side bobbin 24 covering the other side of the magnetic core 11. ing. The pair of guide walls 45 is configured in the same manner as the pair of guide walls 45 formed on the one side surface bobbin 23.

  With the above configuration, first, the tip of the lead wire 15 is pushed into the gap G between the surface of the fixed region AR2 and the convex body 42 in the other side bobbin 24, as indicated by the bold line in FIG. Secure with. Next, a portion extending from the end opposite to the winding forming area AR1 side of the convex body 42 of the lead wire 15 is passed through the gap between the holding portion 34A and the hook portion 44A, and then the hook portion 44A. Next, the magnetic core 11 is pulled out to the other side surface and pushed between the pair of guide walls 45. Accordingly, the lead wire 15 can be pulled out from the holding portion 34A located on the inner peripheral side of the bobbin 12 to the outer peripheral side of the bobbin 12 in a state where the lead wire 15 is hooked on the hook portion 44A and bent in an L shape. It has become.

  Therefore, the ammeter 1 including the holding portions 33A and 34A can easily and reliably insulate the tip ends of the lead wires 14 and 15 by the separation wall 41 in the same manner as the configuration including the holding portions 33 and 34. In addition, after the manufacture of the core sensors 2 and 3 and before the execution of the process of attaching the core sensors 2 and 3 to the core covers 4 and 5, a tensile force or the like is applied to the lead wires 14 and 15. Even if such a load is applied, it is possible to greatly reduce the occurrence of problems such as unwinding of the winding wire 13.

  Moreover, according to this ammeter 1, since each holding | maintenance part 33A, 34A is equipped with the separation wall 41 and the convex-shaped body 42, the front-end | tip part of the lead wire 14 with which the start end part 13a was connected to the core wire, and a core wire The tip of the lead wire 15 to which the end portion 13b is connected is simply pushed into the gap G between the surface of the corresponding side bobbins 23, 24 and the inner surface of the corresponding convex portions 42 of the holding portions 33A, 34A. With a simple operation, the tip portions of the lead wires 14 and 15 can be reliably held by the corresponding holding portions 33A and 34A. For this reason, the labor (man-hours) for holding the leading end portions of the lead wires 14 and 15 is significantly reduced as compared with the case where the lead wires 14 and 15 are held and stopped with tape or inserted into the hole of the core cover (cover portion). be able to.

  Further, according to the ammeter 1, since the hook portion 44A is provided, the lead wires 14 and 15 are pulled out from the holding portions 33A and 34A in a state where the lead wires 14 and 15 are hooked on the corresponding hook portions 44A, thereby the core cover (cover Compared to the configuration in which the lead wires 14 and 15 are simply inserted into the holes of the part (1), even if a load such as a large tensile force is applied to the lead wires 14 and 15, the occurrence of problems such as unwinding or disconnection of the winding 13 is ensured. Can be prevented. In addition, compared to the case where the leading ends of the lead wires 14 and 15 are fixed with tape or inserted into the holes of the core cover (cover portion), the leading ends of the lead wires 14 and 15 are held. Time and effort (man-hours) can be significantly reduced.

  Further, in the above example, each of the holding portions 33, 34, 33A, and 34A is provided with the separation wall 41 standing substantially perpendicular to the surface of the fixed region AR2, and the upper edge of the separation wall 41 toward the side. However, the present invention is not limited to this configuration. Although not shown, various configurations such as a configuration in which the entire cross-sectional shape of the separation wall 41 and the convex body 42 are formed in a C shape can be employed. Further, when the leading ends of the lead wires 14 and 15 are sufficiently fixed in the state where they are held by the holding portions 33, 34, 33A, and 34A, a configuration in which the hook portions 44 and 44A are not provided may be employed. Of course.

  Further, in the above example, a configuration in which the separation wall 41 is included in each of the holding portion 33 and the holding portion 34 is adopted, but although not illustrated, the separation wall 41 is different from the holding portion 33 and the holding portion 34. The structure formed in the body can also be adopted. In the above example, the holding portion 33 including the separation wall 41 is formed on one side surface bobbin 23 and the holding portion 34 including another separation wall 41 is formed on the other side surface bobbin 24. However, although not illustrated, a configuration in which the holding portion 33 and the holding portion 34 are formed on either one of the one side surface bobbin 23 and the other side surface side bobbin 24 may be employed. In addition, when this configuration is adopted, the holding portion 33 and the holding portion 34 can share one separation wall 41 (that is, a configuration in which one separation wall 41 is provided).

  Further, as an example of the measurement apparatus, the ammeter 1 having only the current measurement function for measuring the measurement current flowing through the measurement target has been described as an example, but other physical quantities are measured together with the same current measurement function as the ammeter 1. Of course, a measuring apparatus having a function is also included in this measuring apparatus. For example, a power meter that has the same current measurement function as the ammeter 1 and a voltage measurement function that measures a voltage as another physical quantity and measures power based on the measured current and voltage is also included in this measurement device. . Also, this measuring device includes a voltage measuring function for measuring a voltage as another physical quantity together with the same current measuring function as the ammeter 1 and measuring resistance based on the measured current and voltage. .

1 Ammeter
2, 3 Core sensor 11 Magnetic core 12 Bobbin 13 Winding 13a Start end 13b End end 14, 15 Lead wire 33, 34, 33A, 34A Holding part 41 Separating wall 42 Protruding body 44, 44A Hook part AR1 Winding formation area AR2 Fixed area

Claims (4)

A magnetic core formed in an annular shape as a whole, a bobbin fitted on the magnetic core, a winding formed on the magnetic core with the bobbin interposed, and a start end and a termination drawn from the winding A core sensor with lead wires connected to each part,
The bobbin includes a winding formation region in which the winding is formed along a circumferential direction of the magnetic core, and a fixing region that fixes the start end and the end.
The fixed region of the bobbin is erected on the surface of the fixed region, and is connected to the leading end portion of one lead wire connected to the start end portion and the other lead wire connected to the terminal end portion. A core sensor in which a separation wall that separates the tip portions from each other and a pair of holding portions that individually hold the tip portion of the one lead wire and the tip portion of the other lead wire are formed.   One holding portion of the pair of holding portions extends from one wall surface of the separation wall facing the tip portion of the one lead wire, and the tip portion is between the surface in the fixed region. One of the pair of holding portions is provided, and the other holding portion of the pair of holding portions extends from the other wall surface of the separation wall facing the tip portion of the other lead wire. The core sensor according to claim 1, further comprising another convex body that holds the surface between the fixed region and the surface.   The core sensor according to claim 1 or 2, wherein a hook portion for hooking the lead wire drawn from the holding portion is formed on one of the surface of the holding portion and the fixed region of the bobbin.   An electrical signal having an amplitude according to a current value of a measurement current flowing through a measurement object inserted into the annular magnetic core, comprising the core sensor according to claim 1, and the one lead wire Measuring device that outputs between the other lead wires.

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